/Engine/Plugins/Editor/EditorScriptingUtilities/Source/EditorScriptingUtilities/Public/EditorLevelLibrary.h
Remove all actors from the selection set
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Development|Editor", Meta=(DeprecatedFunction, DeprecationMessage="The Editor Scripting Utilities Plugin is deprecated - Use the function in Editor Actor Utilities Subsystem")) static void ClearActorSelectionSet()